Sorry for the delay in replying, been away for a while.
From memory and with the glove compartment removed, there was a wiring loom on the LHS. Part of tis was covered with the grey sticky backed foam. Once this was peeled back the audio patch lead was there.
Mine (on a 2010 focus titanium), had a cable loop already plugged in. It was this loop that had to be replaced to make the system work. I do not know if there is a cabling difference between the 2009 and 2010.
Hope this helps a little